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Intelligent optimization of cold radial forging process for 20CrMnTiH alloy based on GA-BP and performance analysis

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2024年第9-10期135卷 4281-4307页

作者： Xu, Wenxia wang, Zhaohui Zhu, xuwen Zhang, Bowen Zheng, Zecheng Lv, Mi wang, Hongxia Wuhan Univ Sci & Technol Key Lab Met Equipment & Control Technol Minist Educ Wuhan 430081 Hubei Peoples R China Wuhan Univ Sci & Technol Hubei Key Lab Mech Transmiss & Mfg Engn Wuhan 430081 Hubei Peoples R China Chongqing Construction Ind Grp Co Ltd Chongqing 400054 Peoples R China Hubei Univ Automot Technol Coll Mech Engn Shiyan 442002 Hubei Peoples R China

Cold radial forging (CRF) is recognized as one of the most effective manufacturing processes for the production of hollow components. Nonetheless, even minor alterations in the alloy composition during the cold deformation processing phase can significantly influence the material's manufacturability. This study addresses the challenges associated with high optimization costs, complex data acquisition, and the prediction of forming quality when integrating multiple processes, such as heat treatment and material composition. We propose the development of an intelligent predictive model aimed at forecasting the forming quality of the 20CrMnTiH alloy during CRF, utilizing a back-propagation neural network optimized by genetic algorithm (GA-BP). The assessment of forming quality is based on parameters such as damage, residual stress, and equivalent strain. The study investigates the impact of alloy composition and spheroidal annealing (SA) process parameters on forming quality. The performance of the three GA-BP prediction models is superior in terms of the coefficient of determination (R2) and mean square error (MSE), when compared to a conventional BP neural network and four other machine learning techniques, including gradient-boosted decision trees, random forests, support vector regression, and logistic regression. A comprehensive comparative analysis of the evaluation metrics across all three prediction models, alongside multi-objective optimization, indicates that the Pareto solution set generated by NSGA-II exhibits optimal distribution uniformity. The optimized process parameters (0.17%C-0.24%Si-0.81%Mn-0.03%P-0.03%S-1.15%Cr-0.05%Ni-0.06%Ti, Te: 60 degrees C, ATi: 4.57 h) resulted in a reduction of residual stresses by 12%, equivalent strain by 15%, and component damage by 30%. The results demonstrate that the methodology proposed in this paper not only enhances the quality of CRF molding but also significantly improves the accuracy of the predictive model for f

关键词： 20CrMnTiH alloy Cold radial forging Alloy composition Spheroidizing annealing GA-BP neural network

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棉花品种金垦1775选育及栽培技术

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中国棉花 2023年第1期50卷 30-32,F0003页

作者：王旭文余渝孔宪辉刘丽司爱君赵福相刘文豪新疆农垦科学院棉花研究所/农业农村部西北内陆区棉花生物学与遗传育种重点实验室新疆石河子832000

金垦1775于2022年8月通过新疆审定。该品种长势较强,株型清秀,通透性好,茎秆坚韧,吐絮畅且集中,含絮适中,适宜机械采收,纤维品质达到国家棉花品种审定Ⅱ型品种要求。2018―2019年新疆维吾尔自治区早熟棉组区域试验中,金垦1775的2年区域... 详细信息

金垦1775于2022年8月通过新疆审定。该品种长势较强,株型清秀,通透性好,茎秆坚韧,吐絮畅且集中,含絮适中,适宜机械采收,纤维品质达到国家棉花品种审定Ⅱ型品种要求。2018―2019年新疆维吾尔自治区早熟棉组区域试验中,金垦1775的2年区域试验平均每666.7 m^(2)籽棉、皮棉和霜前皮棉产量分别为365.5 kg、153.5 kg和151.1 kg,分别比对照新陆早61号增产4.5%、7.7%和7.4%。对金垦1775的选育过程、特征特性进行概述,并对其栽培技术要点进行总结,为该品种的推广应用提供参考。

关键词：棉花品种选育金垦1775 优质抗病栽培技术

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固化条件对环氧树脂胶黏剂粘合强度的影响

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材料开发与应用 2022年第5期37卷 45-48页

作者：单淑曦尹帅王绪文李景瑞王兵程伟中国船舶集团有限公司第七二五研究所河南洛阳471023

研究了不同固化条件(温度、湿度)以及反应物配比对环氧树脂胶黏剂粘合强度的影响。结果表明,在使用环氧树脂胶黏剂粘接橡胶与金属基体时,固化条件对其粘接效果产生了显著影响。当温度为25℃,环氧树脂胶黏剂在湿度小于55%时粘合强度较高... 详细信息

研究了不同固化条件(温度、湿度)以及反应物配比对环氧树脂胶黏剂粘合强度的影响。结果表明,在使用环氧树脂胶黏剂粘接橡胶与金属基体时,固化条件对其粘接效果产生了显著影响。当温度为25℃,环氧树脂胶黏剂在湿度小于55%时粘合强度较高,湿度过高,粘合强度会明显下降,说明过于潮湿的环境不利于环氧树脂胶黏剂的应用。当湿度为55%,环氧树脂胶黏剂在20~25℃时粘合强度较高,当温度升高或者降低至10℃时,粘合强度都会有明显下降。

关键词：环氧树脂胶黏剂环境因素粘合强度

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A novel electromagnetic wave absorption geopolymer originated from iron tailings and blast furnace slag

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MATERIALS AND STRUCTURES 2025年第1期58卷 1-14页

作者： Ning, xuwen Yang, Lang Rao, Feng wang, Tianyu Wu, Shengping Huang, Hanhui Fuzhou Univ Zijin Sch Geol & Min Fuzhou 350108 Fujian Peoples R China Zhiyong Construct Grp Co Ltd Fuzhou 350800 Fujian Peoples R China Fuzhou Univ Fujian Key Lab Green Extract & High Value Utilizat Fuzhou 350108 Fujian Peoples R China State Key Lab Mineral Proc Beijing 102628 Peoples R China Fujian JiangXia Univ Sch Engn Fuzhou 350108 Fujian Peoples R China Zhongke Chengfa Fujian Construct Grp Co Ltd Nanping 354105 Fujian Peoples R China Coll Civil Engn Fujian ChuanZheng Commun Coll Fuzhou 350007 Fujian Peoples R China

In this work, a novel electromagnetic wave absorption geopolymer was created with efficient utilization of two solid wastes iron tailings and blast furnace slag, meanwhile the mechanism and impacts of iron tailings content, water-solid ratio and specimen thickness on their electromagnetic wave absorption and mechanical property were systematically investigated. It was found the pores, micro-cracks and unreacted particles in the specimens are benefitial for electromagnetic wave absorption but against to compressive strength, even though the compressive strength reaches 69.7 MPa with the iron tailings content 50% and water-solid ratio 0.4. The addition of iron tailings significantly enhances the electromagnetic wave absorption properties of the geopolymers, and increasing iron tailings content improves the number of pores, micro-cracks and the permeability of geopolymers. The electromagnetic wave absorption properties of the geopolymer initially increase and then decrease with the increase of specimen thickness and water-solid ratio. With an iron tailings content 70%, water-solid ratio 0.4 and thickness 30 mm, the effective absorption bandwidth (< -5 dB) was optimized to 10.44 GHz with a minimum reflection loss of -13.34 dB. A new mechanism for electromagnetic absorption in iron tailings has been proposed, in which the electromagnetic wave absorption of geopolymers is mainly dominated by magnetic loss and spatial propagation loss. This study provides higher competitiveness and comprehensive utilisation of iron tailings in the field of electromagnetic wave absorbing building materials, and has great potential for applications in military and other fields affected by high electromagnetic wave frequencies.

关键词： Iron tailings Geopolymers Microwave absorption Reflectivity

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Lymphoma cell-driven IL-16 is expressed in activated B-cell-like diffuse large B-cell lymphomas and regulates the pro-tumor microenvironment

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HAEMATOLOGICA 2025年第2期110卷 425-438页

作者： Guan, xuwen wang, Yi Fang, Teng wang, Jingya Li, Ru Hao, Mu Qiu, Lugui Chinese Acad Med Sci & Peking Union Med Coll Inst Hematol & Blood Dis Hosp Natl Clin Res Ctr Blood Dis State Key Lab Expt HematolHaihe Lab Cell Ecosyst Tianjin Peoples R China Tianjin Inst Hlth Sci Tianjin Peoples R China Tianjin First Cent Hosp Dept Hematol Tianjin Peoples R China Nankai Univ Affiliated Cent Hosp 1 Dept Hematol Tianjin Peoples R China Tianjin Med Univ Tianjin Med Univ Canc Inst & Hosp Natl Clin Res Ctr Canc Tianjin Peoples R China Tianjin Med Univ Tianjin Canc Inst & Hosp Key Lab Canc Prevent & Therapy Tianjin Peoples R China Tianjin Med Univ Tianjin Canc Inst & Hosp Tianjins Clin Res Ctr Canc Tianjin Peoples R China Tianjin Med Univ Tianjin Canc Inst & Hosp Tianjin Lung Canc Ctr Dept Thorac Oncol Tianjin Peoples R China

The activated B-cell-like subtype of diffuse large B-cell lymphoma (ABC-DLBCL) displays a worse outcome than the germinal center B-cell-like subtype (GCB-DLBCL). Currently, targeting the tumor microenvironment (TME) is the most promising approach to cure DLBCL with profound molecular heterogeneity;however, the factors affecting the tumor-promoting TME of ABC-DLBCL remain elusive. Here, cytokine interleukin-16 (IL-16) is expressed in tumor cells of ABC-DLBCL and secreted by the cleavage of active caspase-3. The serum IL-16 levels are not only a sensitive marker of treatment response, but also positively correlated with unfavorable prognosis in DLBCL patients. While IL-16 shows few direct promotional effects on tumor cell growth in vitro, its bioactive form significantly promotes tumor progression in vivo. Mechanically, IL-16 increases the infiltration of macrophages by the chemotaxis of CD4+ monocytes in the TME, enhancing angiogenesis and the expression of cytokine IL-6 and IL-10, as well as decreasing T-cell infiltration to accelerate tumor progression. This study demonstrates that IL-16 exerts a novel role in co-ordinating the bidirectional interactions between tumor progression and the TME. IMM0306, a fusion protein of CD20 mAb with the CD47 binding domain of SIRP alpha, reverses the tumor-promoting effects of IL-16, providing new insights into treatment strategy in ABC-DLBCL.

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Alexandrov's Theorem for Anisotropic Capillary Hypersurfaces in the Half-Space

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ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS 2023年第2期247卷 1-19页

作者： Jia, Xiaohan wang, Guofang Xia, Chao Zhang, xuwen Xiamen Univ Sch Math Sci Xiamen 361005 Peoples R China Univ Freiburg Math Inst Ernst Zermelo Str 1 D-79104 Freiburg Germany

In this paper, we show that any embedded capillary hypersurface in the half-space with anisotropic constant mean curvature is a truncated Wulff shape. This extends Wente's result (Pac J Math 88:387-397, 1980. ) to the anisotropic case and He-Li-Ma-Ge's result (Indiana Univ Math J 58(2):853-868, 2009. ) to the capillary boundary case. The main ingredients in the proof are a new Heintze-Karcher inequality and a new Minkowski formula, which have their own interest.

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棉花品种新垦M2061选育及栽培技术

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中国棉花 2024年第10期51卷 40-43,F0002页

作者：王旭文余渝孔宪辉刘丽司爱君赵福相乔金鑫韩万里新疆农垦科学院棉花研究所/农业农村部西北内陆棉区棉花生物学与遗传育种重点实验室新疆石河子832000

新垦M2061于2023年11月通过国家农作物品种审定委员会审定。该品种长势较强,整齐度好,不早衰,吐絮畅且集中,纤维品质达到国家棉花品种审定Ⅱ型品种要求。2020―2021年西北内陆棉区联合体早熟常规棉花品种区域试验中,2年平均新垦M2061每6... 详细信息

新垦M2061于2023年11月通过国家农作物品种审定委员会审定。该品种长势较强,整齐度好,不早衰,吐絮畅且集中,纤维品质达到国家棉花品种审定Ⅱ型品种要求。2020―2021年西北内陆棉区联合体早熟常规棉花品种区域试验中,2年平均新垦M2061每666.7 m^(2)籽棉、皮棉和霜前皮棉产量分别为384.8 kg、161.4 kg和157.9 kg,分别比对照新陆早61号增产8.6%、7.8%和8.0%。对新垦M2061的选育过程、特征特性进行了简述,并对其栽培技术要点进行了总结,为该品种的推广应用提供参考。

关键词：棉花品种选育新垦M2061 特征特性农艺性状产量纤维品质栽培技术

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A Time-Dependent Inclusion-Based Method for Continuous Collision Detection between Parametric Surfaces

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ACM TRANSACTIONS ON GRAPHICS 2024年第6期43卷 1-11页

作者： Chen, xuwen Yu, Cheng Ni, Xingyu Chu, Mengyu wang, Bin Chen, Baoquan Peking Univ Sch Intelligence Sci & Technol Beijing Peoples R China Peking Univ Sch Comp Sci Beijing Peoples R China Peking Univ State Key Lab Gen Artificial Intelligence Beijing Peoples R China BIGAI State Key Lab Gen Artificial Intelligence Beijing Peoples R China

Continuous collision detection (CCD) between parametric surfaces is typically formulated as a five-dimensional constrained optimization problem. In the field of CAD and computer graphics, common approaches to solving this problem rely on linearization or sampling strategies. Alternatively, inclusion-based techniques detect collisions by employing 5D inclusion functions, which are typically designed to represent the swept volumes of parametric surfaces over a given time span, and narrowing down the earliest collision moment through subdivision in both spatial and temporal dimensions. However, when high detection accuracy is required, all these approaches significantly increases computational consumption due to the Intelligence, Peking University, high-dimensional searching space. In this work, we develop a new time- dependent inclusion-based CCD framework that eliminates the need for temporal subdivision and can speedup conventional methods by a factor ranging from 36 to 138. To achieve this, we propose a novel time-dependent inclusion function that provides a continuous representation of a moving surface, along with a corresponding intersection detection algorithm that quickly identifies the time intervals when collisions are likely to occur. We validate our method across various primitive types, demonstrate its efficacy within the simulation pipeline and show that it significantly improves CCD efficiency while maintaining accuracy.

关键词： parametric surface continuous collision detection interval analysis

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Pore-Scale Investigation of Decomposition-Methods-Dependent Fluid Flow Properties in Hydrate-Bearing Sediments

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SPE JOURNAL 2024年第1期29卷 138-156页

作者： Bian, Hang Qin, xuwen wang, Zhiyuan Luo, Wanjing Lu, Cheng Zhou, Yingfang China Univ Geosci Sch Energy Resources Beijing Peoples R China China Geol Survey Beijing Peoples R China China Univ Petr Sch Petr Engn Dongying Peoples R China Univ Aberdeen Sch Engn Aberdeen Scotland

Depressurization (PD) and thermal stimulation (TS) are the primary methods for producing gas from natural gas hydrate (NGH) sediments. Fluid flow properties of the hydrate sediment, such as permeability, are fundamental parameters for simulating both processes. Most of the existing formulated permeability models are based on the numerical or experimental investigation of hydrate morphology evolution without considering the decomposition methods. In this study, we investigate the hydrate- decomposition- methods (PD and TS processes)- dependent fluid flow properties of hydrate sediments, which is achieved by microcomputed tomography (micro-CT) scanning of hydrate morphology evolution during PD- and TS- induced decomposition, as well as pore - scale modeling of fluid flow in the extracted 3D fluid- rock- hydrate images. We find that the decomposition behavior during TS is much more complicated than that during PD. The retardation zone in the PD sample increases the heterogeneity of the pore structure, while the secondary hydrates generated during TS cause even more heterogeneity in the pore space. The better facilitation of the TS method on hydrate split is favorable for the continuity of the gas phase. The pore-scale fluid flow simulation shows that the modified Kozeny- Carman (K-C) model is the best to describe the evolution of the normalized permeability with hydrate saturation during PD. However, a single model is not sufficient to describe the normalized permeability during TS decomposition due to the stronger heterogeneous porous structure reformed by the local accumulation of secondary hydrates. The two-phase flow capability is best at the initial stage of PD decomposition, while the two-phase flow region becomes wider as TS decomposition progresses. These results provide significant references for the simulation of the natural hydrate extraction process using different decomposition methods.

关键词： geologist asia government upstream oil & gas geology production logging decomposition reservoir surveillance hydrate hydrate decomposition pore space

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棉花品种金垦1760的选育及栽培技术

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中国棉花 2024年第11期51卷 31-34,F0002页

作者：刘丽余渝孔宪辉王旭文司爱君赵福相乔金鑫韩万里新疆农垦科学院棉花研究所/农业农村部西北内陆区棉花生物学与遗传育种重点实验室新疆石河子832000

金垦1760于2022年11月通过国家审定。该品种长势强,整齐度好,茎秆较粗壮,不早衰,吐絮畅且集中,含絮力适中,适于机械采收,纤维品质达到Ⅲ型品种标准。2019―2020年西北内陆棉区早熟常规机采棉花品种区域试验中,金垦1760平均每666.7 m^(2... 详细信息

金垦1760于2022年11月通过国家审定。该品种长势强,整齐度好,茎秆较粗壮,不早衰,吐絮畅且集中,含絮力适中,适于机械采收,纤维品质达到Ⅲ型品种标准。2019―2020年西北内陆棉区早熟常规机采棉花品种区域试验中,金垦1760平均每666.7 m^(2)皮棉和霜前皮棉产量均比对照增产6%以上。对金垦1760的选育过程、特征特性进行了概述,并对其栽培技术要点进行了总结,为该品种的推广应用提供参考。

关键词：棉花品种选育金垦1760 特征特性栽培技术抗病性产量

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